18 results for Echinogammarus ischnus (scud)

Impact ID Scientific Name Impact Type Study Type Study Location Impact Description Geographic Location Reference
3800 Echinogammarus ischnus Competition Observational Field A mechanism for competitive exclusion of Gammarus fasciatus by Echinogammarus ischnus may be influenced by differences in the physical environment, such as dreissenid mussels, current velocity, and sediment size. St. Lawrence River, USA 16376
3801 Echinogammarus ischnus Competition Experimental Laboratory The competitive displacement of Gammarus fasciatus by Echinogammarus ischnus is mediated more by abiotic factors than by co-occurring exotic predator, the round goby. There was no difference between the two species in their vulnerability to predation on dreissenid-covered substrate, which contrasts with other similar studies. 24601
3802 Echinogammarus ischnus Competition Experimental Laboratory Research in central Europe also reports the invasive Echinogammarus ischnus to be a stronger predator over native gammarids in cases of intraguild predation, suggesting that predation is a probable mechanism of species replacement. 16368
3876 Echinogammarus ischnus Competition Anecdotal N/A Echinogammarus ischnus & Gammarus fasciatus directly compete for resources Great Lakes 13595
6125 Echinogammarus ischnus Competition Observational Field Following its initial establishment, Echinogammarus ischnus became one of the most abundant benthic invertebrates by competively displacing natives in Lake Michigan. Lake Michigan, USA 13238
6126 Echinogammarus ischnus Competition Anecdotal N/A In the Detroit River, Echinogammarus ischnus occupied habitat of native amphipod, Gammarus fasciatus, suggesting the possibility of competitive displacement. Detroit River, USA 13534
6127 Echinogammarus ischnus Competition Anecdotal N/A In the hatchery bay, the establishment of Echinogammarus ischnus and displacement of Gammarus fasciatus in dreissenid and macrophyte areas suggest competitive displacement. Hatchery Bay, Lake Erie, USA 16365
6128 Echinogammarus ischnus Competition Anecdotal N/A Invasive Echinogammarus ischnus is believed to have displaced native amphipod Gammarus fasciatus through competitive displacement. However, stable isotope analysis indicated these two species' diets do not overlap, suggesting a different mechanism of competition. Middle Sister Island, Lake Erie, USA 16374
6129 Echinogammarus ischnus Competition Experimental Laboratory Water chemistry influenced the mutual predation rates of Echinogammarus ischnus and Gammarus fasciatus on each other. In higher conductivity environments, E. ischnus was the dominant predator. 24600
6131 Echinogammarus ischnus Competition Experimental Field A mechanism for competitive exclusion of Gammarus fasciatus by Echinogammarus ischnus is less clear and may be influenced by total or relative amphipod densities. Pelee, Lake Erie 14977
6320 Echinogammarus ischnus Competition Experimental Field On dreissenid mussel beds, Echinogammarus ischnus was numerically higher in certain years than Gammarus fasciatus. However, populations of both species fluctuated over time, suggesting other physical environmental factors beside substrate also mediated competition between these two species. This study suggests there is no difference between the two species in their vulnerability to predation on dreissenid-covered substrate, which contrasts with other studies. Lake Saint-Louis, Quebec, Canada 16377
6321 Echinogammarus ischnus Competition Observational Field Following its initial establishment, Echinogammarus ischnus became one of the most abundant benthic invertebrates in the Lake Ontario, Lake Michigan, and Lake Erie watersheds, where it locally displaced the native amphipod Gammarus fasciatus. The initial replacement of G. fasciatus by E. ischnus occurred in primarily rocky and dreissenid-covered habitats, while G. fasciatus populations continued to persist on algal and macrophyte covered substrates. Great Lakes, USA 16364
6322 Echinogammarus ischnus Competition Observational Field The initial replacement of Gammarus fasciatus by Echinogammarus ischnus occurred in primarily rocky and dreissenid-covered habitats, while G. fasciatus populations continued to persist on algal and macrophyte covered substrates Lake Erie, Michigan, USA 24588
6323 Echinogammarus ischnus Competition Experimental Field Caged enclosures caused reductions in Echinogammarus ischnus density perhaps because of impeded waterflow. This implies that E. ischnus can out compete other arthropods in high flow environments. 16377
6324 Echinogammarus ischnus Competition Observational Field Echinogammarus ischnus was encountered more frequently than Gammarus fasciatus at high energy coastal sites throughout the Great Lakes. Great Lakes, USA 17963
6325 Echinogammarus ischnus Competition Anecdotal N/A Researchers have suggested that Echinogammarus ischnus can outcompete native species in the Great Lakes is because E. ischnus as potentially benefited from a co-evolved relationship with dreissenid mussels. 13008
6326 Echinogammarus ischnus Competition Experimental Laboratory In lab experiments, fish consumed more Gammarus fasciatus than Echinogammarus ischnus in dreissenid habitats, which likley allows E. ischnus to out compete other species. It is possible that E. ischnus evades predators more easily than G. fasciatus, particularly on dreissenid covered substrate. 16365
6327 Echinogammarus ischnus Competition Anecdotal N/A Available nutrition from mussel bio deposits, in combination with the structural complexity of Dreissena mussel substrate, may have given Echinogammarus ischnus a competitive advantage, stimulating its population expansion in the lower Great Lakes. Lake Erie, USA 14977

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